\begin{table}[htbp]\centering
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\caption{A Model of Political Survival: Cox Proportional Hazards Model\label{table:matched}}
\begin{tabular}{l*{5}{c}}
\hline\hline
                    &\multicolumn{1}{c}{(1)}&\multicolumn{1}{c}{(2)}&\multicolumn{1}{c}{(3)}&\multicolumn{1}{c}{(4)}&\multicolumn{1}{c}{(5)}\\
                    &\multicolumn{1}{c}{Model 1: Baseline}&\multicolumn{1}{c}{Model 2: Free Resources}&\multicolumn{1}{c}{Model 3: Political Risk}&\multicolumn{1}{c}{Model 4: IFI Involvement}&\multicolumn{1}{c}{Model 5: Ratification}\\
\hline
North-South BITs (Logged)&      -0.119         &      -0.279\sym{*}  &      -0.294\sym{*}  &      -0.456\sym{**} &      -0.448\sym{**} \\
                    &    (0.0809)         &     (0.123)         &     (0.135)         &     (0.151)         &     (0.155)         \\
[1em]
Polity II           &      0.0708\sym{***}&      0.0758\sym{***}&      0.0778\sym{***}&      0.0741\sym{**} &      0.0548\sym{*}  \\
                    &    (0.0149)         &    (0.0215)         &    (0.0228)         &    (0.0234)         &    (0.0241)         \\
[1em]
North-South BITs*Polity&      0.0307\sym{**} &      0.0413\sym{**} &      0.0388\sym{*}  &      0.0498\sym{*}  &      0.0494\sym{*}  \\
                    &    (0.0106)         &    (0.0157)         &    (0.0177)         &    (0.0193)         &    (0.0198)         \\
[1em]
PTAs Signed (Logged)&      -0.208\sym{**} &      -0.261\sym{**} &      -0.301\sym{**} &      -0.321\sym{**} &      -0.340\sym{**} \\
                    &    (0.0758)         &    (0.0979)         &    (0.0983)         &     (0.117)         &     (0.112)         \\
[1em]
Num. BITs Inherited &      0.0495         &      0.0123         &      0.0564         &      0.0848         &      0.0789         \\
                    &    (0.0443)         &    (0.0600)         &    (0.0700)         &    (0.0774)         &    (0.0767)         \\
[1em]
GDP per Capita (2005 PPP, Logged)&      0.0777         &      -0.213\sym{*}  &      -0.204\sym{*}  &      -0.222\sym{*}  &      -0.257\sym{**} \\
                    &    (0.0663)         &     (0.102)         &    (0.0980)         &     (0.104)         &    (0.0979)         \\
[1em]
Population (Logged) &      0.0989\sym{*}  &      0.0249         &      0.0320         &     -0.0110         &     -0.0366         \\
                    &    (0.0442)         &    (0.0548)         &    (0.0565)         &    (0.0802)         &    (0.0805)         \\
[1em]
GDP Growth Rate     &      -3.320\sym{***}&      -1.610\sym{*}  &      -1.505         &      -1.268         &      -1.333         \\
                    &     (0.597)         &     (0.821)         &     (0.876)         &     (0.953)         &     (0.938)         \\
[1em]
FDI (\% of GDP)     &                     &    -0.00476         &     0.00526         &      0.0231         &      0.0228         \\
                    &                     &    (0.0229)         &    (0.0235)         &    (0.0232)         &    (0.0238)         \\
[1em]
Fuel Exports (\% of Merchandise Exports)&                     &   -0.000774         &    0.000163         &   -0.000792         &   -0.000312         \\
                    &                     &   (0.00348)         &   (0.00427)         &   (0.00423)         &   (0.00418)         \\
[1em]
Aid (\% of GDP)     &                     &      -7.237\sym{***}&      -6.630\sym{***}&      -7.484\sym{**} &      -7.733\sym{***}\\
                    &                     &     (2.091)         &     (1.941)         &     (2.289)         &     (2.230)         \\
[1em]
HRV Transparency Index&                     &                     &       0.548         &       0.768         &       0.604         \\
                    &                     &                     &     (0.676)         &     (0.879)         &     (0.832)         \\
[1em]
Under IMF Program   &                     &                     &                     &     -0.0264         &     -0.0567         \\
                    &                     &                     &                     &     (0.194)         &     (0.191)         \\
[1em]
Num. World Bank Programs&                     &                     &                     &      0.0500         &      0.0531         \\
                    &                     &                     &                     &    (0.0306)         &    (0.0306)         \\
[1em]
Political Constraints&                     &                     &                     &                     &       1.010         \\
                    &                     &                     &                     &                     &     (0.560)         \\
\hline
Observations        &        3483         &        2041         &        1788         &        1569         &        1568         \\
\hline\hline
\multicolumn{6}{l}{\footnotesize Standard errors in parentheses}\\
\multicolumn{6}{l}{\footnotesize \sym{*} \(p<0.05\), \sym{**} \(p<0.01\), \sym{***} \(p<0.001\)}\\
\end{tabular}
\end{table}
